Lookup tables with API calls - using {key} as field name in the result


I am looking to use Lookup Tables with an API for converting currencies in my data.

If I call http://api.fixer.io/latest?symbols=USD I get {“base”:“EUR”,“date”:“2017-07-31”,“rates”:{“USD”:1.1727}}.

My lookup URL looks like this: http://api.fixer.io/{key} How should my single value JSON path look like if I want to obtain the conversion rate for that key? I cant seem to be able to pass the {key} value to the JSON path…

Any hints?

Thanks for your attention.

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